Alpha -Atomic # goes down by 2-Mass goes down by 4;can penetrate a piece of paper Uranium-238 decays through a decay into Thorium-234 Beta -Atomic # goes up by 1-Mass has no change; can penetrate a piece of aluminum Gamma -Atomic # and mass have no change; very powerful light energy; can penetrate lead 238 92 U ______________234 90 Th 234 90 Th ______234 91 Pa ______234 92 U
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